<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <table id="table" border="1"></table>
    <script>
        //在页面上打印九九乘法表
        var b=document.getElementById('table')
        console.log(b)

        var a=document.getElementById('table').innerHTML
        // console.log(a)
        for(var i=1;i<=9;i++){
            a+='<tr>'
            for(var j=1;j<=i;j++){
                a+='<td>'
                a+=j+'×'+i+'='+j*i
                a+='</td>'
            }
            a+='</tr>'
        }
        console.log(a)
        b.innerHTML+=a
        console.log(b)
        // document.write(b)

    </script>
</body>
</html>